Scientific Name:Centaurea diffusa Common Names: Diffuse Knapweed White Knapweed, Spreading Knapweed, Tumble Knapweed Life Span: Short lived; non-creeping perennial; spreads from seeds; seeds have been viable for more than 12 years; Characteristics: Flowers: Color is white Leaves: The leaves of Diffuse Knapweed and Russian Knapweed are very different.
Diffused Knapweed Leaves
Interesting Facts: 1. Native to Eurasia 2. First introduced to the Pacific Northwest
Impacts: 1. Crowds out native species 2. Invades roadsides, range lands, and disturbed areas
3. Can cause eye infections in livestock **__Control Methods:__** Mechanical Control: hand pulling is best used when it is a small infestations Chemical Control:Tordon is best used because it is groundwater contaminated and won't kill trees Means of Introduction: introduced accidentally by means of contaminated seeds Definitions:Bracts
Common Names: Diffuse Knapweed White Knapweed, Spreading Knapweed, Tumble Knapweed
Life Span: Short lived; non-creeping perennial; spreads from seeds; seeds have been viable for more than 12 years;
Characteristics:
Flowers: Color is white
Leaves: The leaves of Diffuse Knapweed and Russian Knapweed are very different.
Interesting Facts:
1. Native to Eurasia
2. First introduced to the Pacific Northwest
Impacts:
1. Crowds out native species
2. Invades roadsides, range lands, and disturbed areas
3. Can cause eye infections in livestock
**__Control Methods:__**
Mechanical Control: hand pulling is best used when it is a small infestations
Chemical Control:Tordon is best used because it is groundwater contaminated and won't kill trees
Means of Introduction: introduced accidentally by means of contaminated seeds
Definitions: Bracts
References:
http://www.ext.colostate.edu/pubs/natres/03110.html